The Fascinating Phenomenon Of Whistled Languages

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Almost all of us have whistled at one time or another, whether out of sheer boredom or to cover up our latest prank. You may also have used whistling to communicate with your dog or to express admiration for a pretty girl.
However, some people around the world have taken this puckered-up method of messaging to a whole different level of awesomeness. They've used piercing whistles for everything from transmitting village gossip, to warning of pirate attacks - with the sounds able to travel for miles.